Whats the best way to solve x2 - 4x = 8

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =

If 3 3/4 lb. of candy costs 20.25 how much would 1lb. of candy cost